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〖AG a〗 = {s1;s3} 〖AF AG a〗 = {s0;s1;s2;s3} 〖!a & A F A G a〗 = {s0;s2} 〖AFG a〗 = {s0;s1;s2;s3} 〖!a & AFG a〗 = {s0;s2}